.height100 {
  height: 100vh;
}

.loginBox {
  border: 1px solid gray;
  height: 400px;
  text-align: center;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -ms-border-radius: 5px;
  -o-border-radius: 5px;
}